Munida julumunyju, McCallum & Ahyong & Andreakis, 2021

McCallum, Anna W., Ahyong, Shane T. & Andreakis, Nikos, 2021, New species of squat lobsters of the genus Munida from Australia, Memoirs of Museum Victoria 80, pp. 113-152 : 121-125

Munida julumunyju sp. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:A4CFAE49-1832-

4C56-BDED-A68F843BB9F4

Figures 3B–D , 6, 7

Munida rubridigitalis . — Poore et al., 2008: 20, unnumbered fig.

(upper right) — McEnnulty et al., 2011: app. 1, 2.

Type material. Holotype: WAM C78559 , female cl 22.4 mm, pcl 15.8 mm), Western Australia, Onslow L 19 transect, 20° 07.962'S, 114° 58.71'E to 20° 07.584'S, 114° 58.416'E, 415–470 m, SS05/2007/15, 11 June 2007.

Paratypes (all Western Australia): NMV J56082 , 1 female (cl 24.4 mm, pcl 16.3 mm), collected with holotype ; NMV J55979 , 1 male (cl 22.0 mm, pcl 15.0 mm), 1 ovigerous female (cl 18.8 mm, pcl 13.3 mm), Dampier L20 transect, 19° 43.776' S, 115° 21.216' E to 19° 43.56' S, 115° 20.598' E, 389–423 m, SS05/2007/34, 12 June 2007 ; NMV J55061 , 1 juvenile (cl 9.2 mm, pcl 10.8 mm), Carnarvon , 24° 33.12' S, 112° 15.12' E to 24° 33.804' S, 112° 15.18' E, 396–404 m, SS10/2005/122, 7 December 2005 ; NMV J55062 , 1 juvenile (cl 10.9 mm, pcl 6.6 mm), Red Bluff , 23° 59.196' S, 112° 32.04' E to 23° 59.724' S, 112° 31.74' E, 411 m, SS10/2005/130, 8 December 2005 ; WAM C78560 , 2 males (cl 22.6 mm, pcl 14.8 mm; cl 27.0 mm, pcl 19.2 mm) , 1 female (cl 22.6 mm, pcl 16.0 mm), Point Cloates , 22° 50.808' S, 113° 20.28'E to 22° 51.228'S, 113° 19.98'E, 420–430 m, SS10/2005/137, 9 December 2005 ; NMV J55060 , 1 male (cl 24.2 mm, pcl 16.7 mm), Ningaloo South , 22° 04.374' S, 113° 45.36' E to 22° 04.968' S, 113° 45.36' E, 391–396 m, SS10/2005/148, 10 December 2005 ; NMV J55064 , 1 male (broken rostrum; pcl 10.8 mm), Ningaloo South , 22° 04.314'S, 113° 45.36' E to 22° 04.854' S, 113° 45.36' E, 387–399 m, SS10/2005/151, 10 December 2005 ; NMV J55059 , 1 female (cl 23.2 mm, pcl 15.9 mm), Ningaloo North , 21° 58.212' S, 113° 47.46' E to 21° 58.806' S, 113° 47.1' E, 373–382 m, SS10/2005/165, 12 December 2005 ; NMV J55058 , 2 males (cl 17.0 mm, pcl 11.1 mm; cl 25.8 mm, pcl 18.4 mm), Barrow Island , 21° 00.402' S, 114° 22.86' E to 21° 00.042' S, 114° 22.5' E, 399–408 m, SS10/2005/172, 13 December 2005 .

Other material examined. New Caledonia: MNHN-IU-2014-15475, 2 females (cl 14.6 mm, pcl 9.1 mm; cl 18.5, pcl 11.5), 3 males (cl 14.3– 16.0 mm, pcl 8.5–10.1 mm), east coast, 21° 14.84' S 165° 55.49' E , 450–

490 m, HALIPRO 1 CP869, 23, March 1994; MNHN-IU-2014-15474, 1 female (cl 15.8 mm, pcl 10.3 mm), Norfolk Ridge , 22° 10' S 167° 15.2' E, 495–515 m, BIOCAL CP109, 9 September 1985 .

Description. Carapace. Length 0.9 × greatest width, widest at midlength. Dorsal surface with main transverse ridges mostly uninterrupted, with secondary transverse striae between main ridges; ridges and striae lined with short, non-iridescent setae. Gastric region with 3–6 pairs of epigastric spines, longest pair behind supraocular spines. Hepatic region with short striae; small parahepatic spine sometimes present. Anterior part of branchial region between cervical groove and postcervical groove with about 6 ridges and some shorter striae; posterior part of branchial region with about 12 transverse ridges (excluding posterodorsal ridge). Cardiac region with 3 or 4 main transverse ridges. Intestinal region with 2 or 3 striae; posterodorsal ridge distinct, with secondary stria. Frontal margin inclined posteriorly at 105° from midline. Lateral margin slightly convex; anterolateral spines parallel, horizontal, just reaching sinus between rostrum and supraocular spine; marginal hepatic spine anterior to cervical groove, much shorter than anterolateral spine; branchial margins with 5 spines. Rostrum laterally compressed; dorsal margin straight, inclined dorsally, ventral margin strongly convex, deepest slightly anterior to midlength, length 0.4–0.5 × pcl; supraocular spine 0.4 × length of rostrum. Epistomial ridge straight, ending at antennal gland; mesial protuberance distinct.

Thoracic sternum. Median length of sternal plastron (sternites 4–7) 0.5 × width of sternite 7. Sternites 4–5 with striae; sternite 6 with few striae. Sternite 3 0.4 width of sternite 4. Sternite 4 anterior margin subtrapezoid, narrowly contiguous with sternite 3.

Abdomen. Somite 2 with 8 small spines evenly spaced along anterior ridge. Somites 2–4 with about 5, 7 and 12 uninterrupted striae behind anterior ridge, respectively, and squamae at lateral margins. Somite 6 posteromedian margin almost straight. Telson with numerous transverse squamae; greatest width 1.7 × median length; anterolateral margin concave.

Eye. Maximum corneal diameter 0.3 × distance between anterolateral spines.

Antennule. Basal article (distal spines excluded) not overreaching corneae; distolateral and distomesial spines subequal; 2 lateral spines, proximal smaller, longer lateral spine exceeding distal spines.

Antenna. Article 1 with distomesial spine reaching midlength of article 2. Article 2 with distomesial spine reaching distal margin of article 4; distolateral spine almost reaching distal margin of article 3. Article 3 and 4 unarmed.

Maxilliped 3. Ischium 1.8 × merus length, with flexor distal spine. Merus with large spine and small distal spine on flexor margin; extensor margin unarmed.

P1. 1.6–1.9 pcl (females), 1.7–2.1 pcl (males), covered in plumose setae and iridescent setae in inner margin; merus 0.6–0.7 pcl (females), 0.7–0.8 pcl (males), with row of 5 small spines on dorsal margin; distomesial spine reaching midlength of carpus. Carpus 0.4 (females), 0.4–0.5 (males) × merus length, length 0.9–1.1 × width, with 5 spines along the mesial margin. Propodus 1.2–1.3 (females), 1.1–1.6 (males) × merus length, dactylus longer than palm, 0.5 × total propodus length; dactylus and pollex outer margin unarmed.

P2–4. Relatively stout, with scales on lateral surface of meri, carpi and propodi; extensor margin with plumose setae and iridescent setae. Meri shorter posteriorly (P3 merus 0.9 × P2 merus length, P4 merus 0.8 × P3 merus length). P2 1.8–2.2 × pcl; merus 0.6–0.8 × pcl, length 4 × width, 2.6–3.0 × carpus length and 1.3–1.6 × propodus length, extensor margin with 11–17 spines, flexor margin with acute ridges and well-developed distal spine; carpus with 2 large spines and 2 or 3 smaller spines on extensor margin, distal spine on flexor margin; propodus length 5 × height, with 6–8 movable flexor spines; dactylus 0.7–0.9 × propodus length, curved, length 5–6 × width, extensor margin densely lined with stiff long setae on distal half, flexor margin with 8–12 spines, space between spines increasing distally, unarmed along distal 1/5. End of P2 carpus almost reaching end of P1 merus. P3 with similar spination and article proportions as P2; merus slightly shorter than P2 merus (0.9); propodus and dactylus as long as those of P2. P4 length 0.8 × P2 length; merus 0.5 × pcl; merocarpal articulation reaching hepatic marginal spine of carapace.

Egg diameter. 0.5 mm.

Colour. Carapace and abdominal somites 2–3 orange, remaining abdomen and telson white. Rostrum white with red subdistal spot, supraocular spines orange. Chelipeds and walking legs with transverse white/pale orange and dark orange bands; distal half of palm and proximal half of cheliped fingers orange, distal half of fingers of cheliped white; dactyli of walking legs white.

Genetic data. COI and 16S; see Table 1.

Etymology. Named julumunyju with approval of the Kariyarra people. The word julumunyju means prawn in Kariyarra language; used as a noun in apposition.

Remarks. Munida julumunyju sp. nov. is very similar to M. rubridigitalis Baba, 1994 , described from Queensland, Australia. Both species have a laterally compressed rostrum with a red mark and red cheliped fingers, the second abdominal somite with 8 or 9 spines along the anterior ridge and subequal distal spines on the basal antennular article. Comparison of M. julumunyju with paratypes of M. rubridigitalis and additional specimens from eastern Australia found that the two species differ chiefly in the shape of the rostrum. The rostrum of both species is laterally compressed, but shallower and more evenly tapered in M. rubridigitalis . In M. rubridigitalis , the ventral rostral margin is gently convex with the dorsal and ventral margins parallel for the proximal half or slightly more, after which they gently converge to the apex. In M. julumunyju sp. nov., however, the rostrum is deeper, with the dorsal and ventral margins distally diverging, reaching the greatest depth slightly anterior to the midlength and then converging to the apex, making the ventral margin more strongly convex than in M. rubridigitalis . In addition, M. rubridigitalis usually has a spine on the mesial margin of the antennal article 2 (occasionally present only on one side), which is always absent in M. julumunyju . Colour-in-life may also be helpful in distinguishing these species. The new species has a red patch on the pterygostomian flap below the linea anomurica, which is noted as absent in M. rubridigitalis by Baba (1994). In M. julumunyju sp. nov. the fingers are completely red with a white tip, whereas M. rubridigitalis is described with only the distal half of the fingers red.

We examined six specimens identified as M. rubridigitalis from New Caledonia in the collections of the MNHN, and herein we identify these specimens as M. julumunyju sp. nov. These specimens agree with M. julumunyju sp. nov. in rostral form and lack of a spine on the mesial margin of antennal article 2. Specimens reported and figured from New Caledonia and the Loyalty Islands as Munida sp. by Macpherson (1994: fig. 13b, 90) also agree with M. julumunyju in rostral form and the colour of the fingers, which are described as red with a white tip. Sequence divergence between M. julumunyju sp. nov. and a New Caledonian specimen of “ M. rubridigitalis ” (MNHN- IU-2014-15474) is 4% (COI) and 0.6% (16S). Thus, further study is required to determine if other reported specimens of “ M. rubridigitalis ” from the New Caledonian region are conspecific with, or distinct from, M. julumunyju sp. nov. The apparently disjunct distribution of M. julumunyju sp. nov. suggests that it can be expected to occur at intermediate localities, possibly off southern Indonesia and Papua New Guinea.

Distribution. Presently known from off Western Australia, 373– 450 m. New Caledonia, 450– 515 m. Loyalty Islands, 540 m.

Figures

Figure 3. A, Munida abrolhos sp. nov., female paratype, cl 27.5 mm, pcl 18.3 mm (NMV J55262); B–D, Munida julumunyju sp. nov., undetermined paratype from NMV J55979, juvenile paratype, cl 9.2 mm, pcl 10.8 mm (NMV J55061), juvenile paratype cl 10.9 mm, pcl 6.6 mm (NMV J55062); E, Munida lutruwita sp. nov. ovigerous female, cl 14.3 mm, pcl 10.6 mm, (AM P103229). Photos: K. Gowlett-Holmes, CSIRO.